I don't think you're getting any bad suggestions. I have a small 12x12x9 foot room and have done some experimenting. I have found that my small room does very well with a sealed speaker. Looking at your current choices, I think this would point more to the direction of the Merlin TSM as it is a sealed speaker designed in a true monitor philosophy. I am using the Harbeth HL-P3ES-2 driven by the Levinson 383. The Harbeth is the evolution of the traditional sealed monitor; it may be a consideration and match well with your Plinius.
PS... Don't forget good stands.
Have fun!
PS... Don't forget good stands.
Have fun!